Are you looking for a pedal to sum the signals, or do you want a delay pedal which also sums the signals? If you just want to sum the signals, I have a few suggestions.

What is your budget? Do prefer any vendors specifically (I have some experience helping people in Europe, but not much)?

Well, at first sight, I was looking for a summing device, but the idea to have a delay able to do this as well is tempting. So let me hear your suggestions, I might know some. As it's for a B rig intended for jam sessions and bad paid gigs, it only has to be affordable, so forget about high class devices such as Strymon and Eventide

I have just tried it. It does sum the delays, but not the dry signal. So if you plug in both sides, but use only One output, you will hear the delays of both sides, but only One dry signal.

I still need answers to these questions:

Roughly 200 euros, it seems a quite average price for a delay pedal here (it excludes high end devices).

No preferred vendors (Thomann in Germany may be the most well known seller) nor brands.

Curious about the devices you will find

For summing, you could use the well known Boss LS-2 in "A+B Mix" mode (see pages 49 and 50 of Boss's Guitar Effects Guidebook Volume 20 [sorry, English only]) : since I do not know where you live, here are links for Thomann Belgium and Thomann France.

For summed delay, it seems the TC Electronic ND-1 will do the job: again, here are links for Thomann Belgium and Thomann France. The way I understand it, you would have to set the Nova to Dual Delay mode with a mono output, as explained on page 13 of the manual (that is a link to the French manual, mon ami). The fact that you have to use different subdivisions for each channel means that this mode would be similar to a Flashback which could sum the output: it also means that this is the only mode you could use on the ND-1 without changing your signal routing.

[quote="Robstafarian"]since I do not know where you live, here are links for Thomann Belgium and Thomann France.

Is it so obvious I'm a bad english speaking guy (a French, in other words)?

Thanks for your input. I knew those devices and their capabilities. But it's nice to you. And it's nice to know there's a human search engine dedicated to gear and electronic devices on stickist.com!

I remembered your knowledge of various French Stickists and that you have written in French previously.

Well, so, you just succeed in saving your head from the french guillotine!